Precautions

It is very important that your doctor check you closely while you are receiving this medicine. This will allow your doctor to see if the medicine is working properly and to decide if you should continue to receive it. Blood tests may be needed to check for unwanted effects.

Call your doctor right away if you have an inability to move the legs or arms, or paralysis of one side of the body after receiving this medicine.

Tell your doctor right away if you have sudden, rapid, and painful enlargement of thyroid tumors, noisy breathing, shortness of breath, or voice changes. Your doctor may want you to receive glucocorticoids (steroids) before receiving this medicine.